Two-dimensional finite impulse response filters

Abstract From the Canadian patent

A two-dimensional finite impulse response (FIR) filter comprises a demultiplexer for demultiplexing an input data signal comprising adjacent digital words into p (e.g. 2) slower data signals each having a slower rate equal to 1/p (e.g. ?) of the data rate of the input signal and each comprising every pth (e.g. every alternate) word of the input signal. The slower data signals are passed to p (e.g. 2) filter portions each comprising a horizontal FIR filter and a vertical FIR filter. The horizontal filters are each connected to receive all of the slower data signals and all of them are operative simultaneously to effect horizontal filtration by periodically processing sets of adjacent words …